Pressing device for sanding machines

ABSTRACT

A pressing device for sanding machines is connected to a sanding machine with a transversal frame, at least one transmitting group, and at least one transmission belt, and the pressing device has a holding frame, a pressing frame, a synchronization set, and an auxiliary set. The holding frame is securely connected to the transversal frame to locate in an inner side of the at least one transmission belt. The pressing frame is securely connect to the holding frame to locate in the inner side of the at least one transmission belt, and has multiple rollers deposited on a bottom of the pressing frame and extending toward a lower half of the at least one transmission belt. The rollers of the pressing frame selectively abut the at least one transmission belt to rotate with the at least one transmission belt and to provide a pre-pressing force.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to a pressing device, and more particularly relates to a pressing device for sanding machines that may act with a transmission belt of a sanding machine to provide a pre-pressure and to improve the sanding quality of the sanding machine.

2. Description of Related Art

Generally, a conventional sanding machine is used to sand a surface of a workpiece, and has multiple brush bars that may rotate cyclically to sand the surface of the workpiece. When the surface of the workpiece is a uniform plane, the conventional sanding machine may sand the surface of the workpiece with a consistent sanding effect by the multiple brush bars. However, when the surface of the workpiece is an uneven and irregular plane, the multiple brush bars of the conventional sanding machine may be deformed with the uneven and irregular plane of the workpiece without sanding the surface of the workpiece accurately, and a height difference may be formed between two adjacent brush bars to influence the smoothness of track operation of the conventional sanding machine, and this may influence the sanding quality of the conventional sanding machine. Then, the workpiece with the uneven and irregular plane may need to be processed by subsequent procedures or sanded with the conventional sanding machine several times, and this will increase the time and cost of sanding the workpiece.

To overcome the shortcomings, the present invention provides a pressing device for sanding machines to mitigate or obviate the aforementioned problems.

SUMMARY OF THE INVENTION

The main objective of the present invention is to provide a pressing device for sanding machines that may act with a transmission belt of a sanding machine to provide a pre-pressure and to improve the sanding quality of the sanding machine.

The pressing device for sanding machines in accordance with the present invention is connected to a sanding machine with a transversal frame, at least one transmitting group, and at least one transmission belt, and the pressing device has a holding frame, a pressing frame, a synchronization set, and an auxiliary set. The holding frame is securely connected to the transversal frame to locate in an inner side of the at least one transmission belt. The pressing frame is securely connected to the holding frame to locate in the inner side of the at least one transmission belt, and has multiple rollers deposited on a bottom of the pressing frame and extending toward a lower half of the at least one transmission belt. The rollers of the pressing frame selectively abut the at least one transmission belt to rotate with the at least one transmission belt and to provide a pre-pressing force.

Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a pressing device for sanding machines in accordance with the present invention, deposited on a sanding machine;

FIG. 2 is an enlarged perspective view of the pressing device in FIG. 1;

FIG. 3 is a side view of the pressing device in FIG. 1;

FIG. 4 is another side view of the pressing device in FIG. 1, shown with some components omitted;

FIG. 5 is an enlarged side view in partial section of the pressing device in FIG. 1;

FIGS. 6 to 8 are operational side views of the pressing device in FIG. 1, driven by a driving device; and

FIG. 9 is an operational side view of the pressing device in FIG. 1, shown sanding a workpiece.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

With reference to FIGS. 1 to 4, a pressing device for sanding machines in accordance with the present invention is deposited on a sanding machine 50 having two connecting boards 51, a transversal frame 52, two transmitting groups 55, two transmission belts 56, and multiple brush bars 57. The two connecting boards 51 are deposited in the sanding machine at a spaced interval and face each other. The transversal frame 52 is deposited in the sanding machine 50 between the two connecting boards 51, and has two connecting arms 53 and two linking arms 54. The two connecting arms 53 are deposited in the sanding machine 50 at a spaced interval, face each other, and each one of the two connecting arms 53 is connected to the two connecting boards 51. The two linking arms 54 are deposited in the sanding machine 50 at a spaced interval, face each other, and each one of the linking arms 54 is connected to the two connecting arms 53 adjacent to one of the two connecting boards 51.

The two transmitting groups 55 are deposited in the sanding machine 50 around the traversal frame 52, are parallel with the two connecting arms 53 of the transversal frame 52, and each one of the two transmitting groups 55 has a shaft 551 and two transmitting wheels 552. The shaft 551 is deposited in the sanding machine 50, is parallel with and adjacent to one of the two connecting arms 53, and has two ends. The two transmitting wheels 552 are respectively deposited on the two ends of the shaft 551 of the transmitting group 55. The two transmission belts 56 are connected to the two transmitting groups 55, and each one of the two transmission belts 56 is deposited around two of the transmitting wheels 552 of the two transmitting groups 55 at a same side of the sanding machine 50. Then, each one of the two transmission belts 56 is an annularly arranged structure between two corresponding transmitting wheels 552.

In addition, the shaft 551 of one of the two transmitting groups 55 is connected to and driven by a driving device such as a motor. Then, when the driving device starts working, the two transmitting groups 55 can be rotated with each other synchronously via the two transmission belts 56. The multiple brush bars 57 are deposited on the two transmission belts 56 at spaced intervals, are parallel with the two connecting arms 53 of the transversal frame 52, and are moved and rotated with the two transmission belts 56.

The pressing device is deposited on the transversal frame 52 of the sanding machine 50, and is located in an inner side of one of the two transmission belts 56. Furthermore, in the present invention, with reference to FIG. 1, there are two pressing devices respectively connected to the two linking arms 54 and respectively deposited in the transmission belts 56 of the sanding machine 50. Each one of the two pressing devices comprises a holding frame 10, a pressing frame 20, and a synchronization set 30.

The holding frame 10 is securely connected to one of the two linking arms 54 of the transversal frame 52 at same sides of the two connecting arms 53, and may have at least two fixing boards 11 deposited on an inner side of the holding frame 10 and connected to the corresponding linking arm 54. Each one of the at least two fixing boards 11 has an elongated adjusting hole 12 formed through the fixing board 11. A height of the holding frame 10 relative to a corresponding transmission belt 56 may be adjusted by the adjusting holes 12 of the at least two fixing boards 11. Additionally, the holding frame 10 further has two wheel axles 13 respectively deposited on two ends of the holding frame 10 at an outer side of the holding frame 10.

The pressing frame 20 is securely connected to the holding frame 10 between the two wheel axles 13 and the inner side of the corresponding transmission belt 56, and has multiple rollers 21. The multiple rollers 21 are rotatably deposited on a bottom of the pressing frame 20 at spaced intervals, and extend toward a lower half of the corresponding transmission belt 56.

The synchronization set 30 is connected to the holding frame 10 around the pressing frame 20, and has two synchronous wheels 31 and a synchronous belt 32. The two synchronous wheels 31 are respectively and rotatably mounted on the two wheel axles 13 of the holding frame 10 beside the pressing frame 20. With reference to FIGS. 4 and 5, the synchronous belt 32 is mounted around the two synchronous wheels 31 of the synchronization set 30, and a lower half of the synchronous belt 32 abuts the inner side of the corresponding transmission belt 56 and is connected to the rollers 21 of the pressing frame 20.

With reference to FIGS. 3 and 4, the pressing device of the present invention further has an auxiliary set 40. The auxiliary set 40 is connected to one of the linking arms 54 of the transversal frame 52, is connected to the synchronous belt 32 of the synchronization set 30 at a same side of the transversal frame 52. The auxiliary set 40 has multiple auxiliary wheels 41 deposited at spaced intervals and securely connected to the corresponding linking arm 54 of the transversal frame 52. Each one of the auxiliary wheels 41 abuts against the synchronous belt 32 to rotate with the synchronous belt 32. Additionally, the auxiliary set 40 has multiple adjusting frames 42 connected to the corresponding linking arm 54 and respectively connected to the auxiliary wheels 41. The positions of the adjusting frames 42 can be changed by moving upwardly or downwardly relative to the synchronous belt 32, and this may adjust the abutting conditions of the auxiliary wheels 41 relative to the synchronous belt 32. Then, the tightness of the synchronous belt 32 can be adjusted by the auxiliary wheels 41 via the adjusting frames 42, and the shaking and noise generated by the components when they are rotated can be reduced.

With reference to FIG. 1, in use, two pressing devices are respectively deposited on outer sides of the two linking arms 54 of the transversal frame 52 to locate each one of the two pressing devices in the inner side of one of the two transmission belts 56. The synchronous belt 32 of each one of the pressing devices abuts the inner side of a corresponding transmission belt 56. A driving device that is connected to one of the two shafts 551 of the two transmitting groups 55 starts working to rotate the corresponding shaft 551, and the multiple brush bars 57 are moved and rotated cyclically via the two transmission belts 56 and the two transmitting groups 55. With reference to FIGS. 4 and 5, since the two synchronous belts 32 respectively abut the inner sides of the two transmission belts 56, the two synchronous belts 32 are moved and rotated when the transmission belts 56 are moved and rotated cyclically, and the rollers 21 of the two pressing frames 20 and the auxiliary wheels 41 of the auxiliary set 40 are rotated with the two synchronous belts 32. Then, the shaking and noise generated by the components when they are rotated can be reduced.

With further reference to FIGS. 6 to 8, when the sanding machine 50 is in use, a driving device 60 is deposited on a top of the sanding machine 50 and has a linking set 61 and driving set 62. The linking set 61 is deposited on the top of the sanding machine 50 and has a rotating mount 611 and a linking motor 612. The rotating mount 611 is deposited on the top of the sanding machine 50. The linking motor 612 is deposited in the rotating mount 611 and has a linking rod 613 extending out of the rotating mount 611. The linking set 61 has a linking belt 614 mounted around the linking rod 613 and one of the shafts 551.

The driving set 62 is deposited on the linking set 61 and has a top base 621, a driving motor 622, a rotating shaft 623, and a driving chain belt 624. The top base 621 is deposited on the rotating mount 611. The driving motor 622 is longitudinally deposited in the top base 621. The rotating shaft 623 is deposited between the rotating mount 611 and the top base 621, and has a bottom end and top end. The bottom end of the rotating shaft 623 is securely mounted on the rotating mount 611, and the top end of the rotating shaft 623 extends in the top base 621 via the rotating mount 611. The rotating shaft 623 has a rotating disk 625 deposited on the top end of the rotating shaft 623, and the driving chain belt 624 is mounted around the driving motor 622 and the rotating disk 625 of the rotating shaft 623.

When the driving motor 622 is driven, the rotating shaft 623 is rotated transversally via the driving chain belt 624 and the rotating disk 625, and this enable the sanding machine 50 to rotate relative to the driving device 60. At the same time, the corresponding shaft 551 is rotated longitudinally by the linking motor 612 via the linking rod 613 and the linking belt 614, and the brush bars 57 are moved cyclically by the transmission belts 56. With reference to FIG. 9, when a workpiece 70 with an uneven and irregular surface needs sanding, the workpiece 70 is deposited below the sanding machine 50. When the workpiece 70 is moved relative to the sanding machine 50, the multiple brush bars 57 that are deposited on the two transmission belts 56 are used to sand the uneven and irregular surface of the workpiece 70. When the multiple brush bars 57 are moved toward a concaved portion of the workpiece 70, the multiple brush bars 57 and the two transmission belts 56 may be deformed upwardly to enable the two transmission belts 56 to abut the rollers 21 of the two pressing frames 20. The two pressing frames 20 are securely connected to the transversal frame 52 via the two holding frames 10 without moving relative to the two transmission belts 56 and the workpiece 70.

Therefore, the two pressing frames 20 may provide pre-pressing forces to the multiple brush bars 57 when the multiple brush bars 57 and the two transmission belts 56 are moved relative to the two pressing frames 20 along the uneven and irregular surface of the workpiece 70, and the pre-pressing forces of the two pressing frames 20 may enable the multiple brush bars 57 to keep sanding the workpiece 70 even under an upward deformation condition. Consequently, the workpiece 70 with the uneven and irregular surface can be accurately sanded by the multiple brush bars 57 via the pre-pressing forces of the two pressing frames 20 when the multiple brush bars 57 are deformed by the uneven and irregular surface of the workpiece 70, and this may provide a consistent sanding effect to the workpiece 70 and may improve the sanding quality of the sanding machine 50.

Additionally, in use, the pressing device can be used without the synchronization set 30, since the multiple rollers 21 of the pressing frame 20 still apply pre-pressing forces on the multiple brush bars 57 that are deposited on the two transmission belts 56 to sand the workpiece 70 with the uneven and irregular surface, and this may reduce a height difference between two adjacent brush bars 57 to improve the smoothness of track operation of the sanding machine 50. In addition, when the pressing device is used with the synchronization set 30, the synchronous belt 32 abuts the corresponding transmission belt 56 to provide effects of synchronous rotation of the synchronous belt 32 and the corresponding transmission belt 56 and rotations of the rollers 21. Furthermore, the synchronization set 30 may reduce the wear situation of each one of the rollers 21 and the transmission belts 56 during the operation of the sanding machine 50, and this may prolong the life of each one of the rollers 21 and the transmission belts 56.

According to the above-mentioned features and structural relationships of the present invention, in use, the two holding frames 10 and the two pressing frames 20 are respectively deposited on two sides of the transversal frame 52 to enable the rollers 21 of each one of the two pressing devices 20 to rotate toward the inner side of a corresponding transmission belt 56. When the sanding machine 50 is used to sand a workpiece 70 with an uneven and irregular surface, the rollers 21 of the two pressing devices 20 may apply pre-pressing forces on the upward deformed brush bars 57 and transmission belt 56 to enable the brush bars 57 to sand the concaved portion of the uneven and irregular surface of the workpiece 70 accurately. Then, the sanding machine 50 may provide a consistent sanding effect to the workpiece 70, and the sanding quality of the sanding machine 50 can be improved. Furthermore, when the synchronization set 30 is used with the holding frame 10 and the pressing frame 20, the synchronous belt 32 abuts the corresponding transmission belt 56 to provide effects of synchronous rotation of the synchronous belt 32 and the corresponding transmission belt 56 and rotations of the rollers 21. Furthermore, the synchronization set 30 may reduce the wear situation of each one of the rollers 21 and the transmission belts 56 during the operation of the sanding machine 50, and this may prolong the life of each one of the rollers 21 and the transmission belts 56.

Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and features of the invention, the disclosure is illustrative only. Changes may be made in the details, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. 

What is claimed is:
 1. A pressing device for sanding machines, connected to a sanding machine with a transversal frame, at least one transmitting group deposited outside the transversal frame, and at least one transmission belt connected to the at least one transmitting group, and the pressing device connected to the transversal frame of the sanding machine, located in an inner side of the at least one transmission belt, and having: a holding frame adapted to be securely connected to the transversal frame to locate in the inner side of the at least one transmission belt, and having two wheel axles respectively deposited on two ends of the holding frame at an outer side of the holding frame; a pressing frame securely connected to the holding frame to locate in the inner side of the at least one transmission belt, and having multiple rollers deposited on a bottom of the pressing frame and extending toward a lower half of the at least one transmission belt; wherein the rollers of the pressing frame selectively abut the at least one transmission belt to rotate with the at least one transmission belt and to provide a pre-pressing force; a synchronization set connected to the holding frame around the pressing frame, and having two synchronous wheels respectively and rotatably mounted on the two wheel axles of the holding frame beside the pressing frame; and a synchronous belt mounted around the two synchronous wheels of the synchronization set, and having a lower half abutting the inner side of the at least one transmission belt and connected to the rollers of the pressing frame; and an auxiliary set adapted to be securely connected to the transversal frame to locate in the inner side of the at least one transmission belt, connected to the synchronization set, and having multiple auxiliary wheels deposited at spaced intervals and abutting against the synchronous belt.
 2. The pressing device as claimed in claim 1, wherein the holding frame has at least two fixing boards deposited on an inner side of the holding frame to connect with the transversal frame.
 3. The pressing device as claimed in claim 2, wherein each one of the at least two fixing boards has an elongated adjusting hole formed through the fixing board; and a height of the holding frame relative to the at least one transmission belt is adjusted by the adjusting holes of the at least two fixing boards.
 4. The pressing device as claimed in claim 1, wherein the auxiliary set has multiple adjusting frames respectively connected to the auxiliary wheels to change positions of the auxiliary wheels to adjust tightness of the synchronous belt.
 5. The pressing device as claimed in claim 2, wherein the auxiliary set has multiple adjusting frames respectively connected to the auxiliary wheels to change positions of the auxiliary wheels to adjust tightness of the synchronous belt.
 6. The pressing device as claimed in claim 3, wherein the auxiliary set has multiple adjusting frames respectively connected to the auxiliary wheels to change positions of the auxiliary wheels to adjust tightness of the synchronous belt. 